I shipped an 8-inch round cake from GA to PA via UPS and it arrived in good shape. I had the blessing of a ready made cake box where a patient sent my husband a cake from a bakery about an hour away. It was sturdy cardboard with a styrofoam lining that was cut specifically for shipping 8-in. cakes. It had a place for dry ice and room to put your hands to place and remove the cake. It also had a piece of styrofoam for a lid before closing the box. It had a warning label that the box contained less than 5 pounds of dry ice. I froze my cake and purchased dry ice from a local grocery store, then shipped it. It was removed from trucks about 6 times before being delivered but arrived in good condition. I have looked into buying boxes as described but have not found any. Hope this helps.